A lot of details on this can be found in my later post above.

The myth being propogated by the Left is that a huge segment of the Iraqi population is fighting us, or actively hostile. The estimated number of actual enemy fighters is about 5,000. This is about 1/4,600 of the Iraqi population.

A similar fraction of the population of the United States would be about 65,000 people, or the seating capacity of a single large football stadium.

To be fair, there must be a larger portion of Iraqis that do not take up arms against us, but still support the fighters, if only by ignoring or tolerating their presence in their midst. There is no way to quantify this number accurately (surveys on this subject would tend to get evasive answers at best), but I doubt it is more than a small percentage of the population.